Subsequent Events (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Feb. 01, 2017 USD ($) unit	Nov. 18, 2016 USD ($) $ / shares shares	Mar. 28, 2016 USD ($) $ / shares shares	Aug. 18, 2015 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) unit shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Feb. 03, 2017 USD ($)
Subsequent Event [Line Items]
Issuance of common stock, net (in shares) | shares		6,330,000	9,780,000	16,330,000
Share price to the public (in usd per share) | $ / shares		$ 13.35	$ 11.35	$ 10.50
Proceeds from the issuance of common stock, net		$ 80,900	$ 105,800	$ 163,000		$ 200,402	$ 162,963	$ 0
Premier Senior Living, LLC [Member]
Subsequent Event [Line Items]
Number of units available in living facilities | unit						154
Common Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock, net (in shares) | shares						17,023,824	16,330,000
Subsequent Event [Member] | Premier Senior Living, LLC [Member]
Subsequent Event [Line Items]
Anticipated annual lease revenues	$ 2,200
Subsequent Event [Member] | Wisconsin [Member]
Subsequent Event [Line Items]
Acquisition consideration	$ 26,100
Subsequent Event [Member] | Applewood of Brookfield [Member] | Brookfield, Wisconsin [Member]
Subsequent Event [Line Items]
Number of units available in living facilities | unit	48
Subsequent Event [Member] | Applewood of New Berlin [Member] | New Berlin, Wisconsin [Member]
Subsequent Event [Line Items]
Number of units available in living facilities | unit	40
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock, net (in shares) | shares					1,100,000
Proceeds from the issuance of common stock, net					$ 16,600
Remaining amount available									$ 94,700
Subsequent Event [Member] | Common Stock [Member] | Weighted Average [Member]
Subsequent Event [Line Items]
Share price to the public (in usd per share) | $ / shares					$ 15.46